Preheat
a grill on high heat. Combine oil, garlic, salt and pepper in a small bowl. Place mushrooms stem-side down on a grill tray. Brush
mushrooms with garlic oil to coat. Grill for 2 minutes. Turn mushrooms and
brush with garlic oil. Grill for a further 2 - 3 minutes or until just tender.
Place spinach and grilled mushrooms on serving plates. Spoon a dollop of hummus
on each mushroom. Sprinkle with chives and season with pepper. Serve immediately.